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  1. questionHow to tell different colored objects apart in vision center
    First define three different sensors, putting each of the sensors on a different plane. In order to define your sensor on a certain plane click on the small box just below and on the right hand side of your preview window. This box will change color and is imposing a certain color plane upon the ...

  2. questionThe program that runs on my RCX robot is not the one I downloaded.
    Your program may be getting written over when someone else downloads to their RCX. Try to keep other RCX towers from pointing toward your workstation. If the problem is persists, cover the IR transmitter (the black panel on the RCX that faces the tower when downloading) with tape to keep it from ...

  3. questionWhy am I having problems loading my program to my RCX?
    If you are getting this message it is because you are having trouble communicating between your tower and your RCX. Problems connecting to the tower include: If the green light on the tower is not on, then the tower is not transmitting to the RCX. Check which port the tower is configured to (u ...

  4. questionMy camera image is fuzzy and out of focus.
    The camera is probably out of focus. You can refocus the lego camera by turning the white piece on the camera that the lens is attached to, just as you would to focus an SLR or similar manually-focused camera. This should, if adjusted properly, make the image the camera yields much clearer. If ...

  5. questionThe computer says no response from RCX tower.
    Cause: Tower is not plugged in. Solution: Plug tower into computer. Cause: Tower was moved during download. Solution: Make sure tower does not move at all during download. Cause: RCX lost power and has to download Firmware. Solution: ROBOLAB will ask if you want to download the Firmware if ...

  6. questionHow does my RCX connect to my transmitter?
    The RCX communicates to the tower through infrared (IR) technology. There are no wires used to connect the RCX to the tower. However, there must be an uninterrupted field of vision to the "eye" located on the front of the RCX unit. You can tell when the RCX is communicating when you see a green ...

  7. questionIs it possible to use other sensors with the RCX?
    There are a lot of other sensors that can be used in conjunction with the RCX, all of which can be found in the sensor adaptors list. For example, here is a program that logs the pH over a time span of 10 seconds. All of these sensors are treated exactly the same as the standard RCX sensors and ...

  8. questionWhen I use the LEGO camera, I have shadows across my images. What can I do to get rid of these?
    If you have a lot of dark spots in your image then it is a good idea to build some sort of enclosed structure for your light. This is so that it will be isolated from extraneous light. Here is a picture of several Lego bricks with very bad shadows: These are two pictures of the light box I bu ...

  9. questionThe motors on my robotic creation never stop running!
    There is no stop command for the motors in the program. The program below turns the motors on, waits for 4 seconds then ends the program, but never stops the motors. The motors will then run until the RCX is turned off or runs out of power. Add stop commands for the motors before the program ...

  10. questionMy RCX car spins in place - Why won't it move?
    If the wheels are turning in opposite directions, the direction of a motor can be changed by rotating the wire 180 degrees and plugging it back in. Bad: Car spins clockwise Good: Car goes forward If only one of the wheels is turning, pick the car up and make sure that bot ...

  11. questionWhy didn’t my RCX do what it was supposed to?
    If your program did something very strange or highly unexpected and you are sure that your code is correct, you might have had an error while loading your program. Make sure that you didn't press the program button by accident and put the program into the wrong slot. It is also possible, especi ...

  12. questionWhy does my RCX wait for half a second after I hit the run button?
    In the 0.5 seconds after you hit the run button, the RCX is initializing all of its sensors. KAB

  13. questionCreate an RCX car / creature that will play laser tag with other cars / creatures.
    Each RCX will be assigned a number. It will then have to "tag" other RCXs with the number using mail, while avoiding tags from other competitors. After 5 tags from a competitor's RCX, you take on that RCX's number. The winner is the RCX that has given its number to all the other RCXs. Part A: ...

  14. questionWhen I try to take data, my RCX shuts off!
    The RCX powerdown time may be set too low. In order for the RCX to conserve battery life, it is set to shut down automatically after 15 minutes regardless of what program is running. You can manually change that time by clicking the Administrator button in RoboLab, and then on the "RCX Settings ...

  15. questionWhy is my RCX display counting up?
    The display on the RCX shows the amount of time that the RCX has been on. In ROBOLAB 1.0 - 2.5.4 the display is shown in increments of one minute. In ROBOLAB 2.9, the display is shown down to tenths of a second (to reflect the newer, faster firmware).

  16. questionWhy can't I load the new ROBOLAB 2.9 firmware onto my RCX?
    The ROBOLAB 2.9 firmware for the RCX is larger than the ROBOLAB 2.5.4 firmware, so it may take a greater number of attempts to load the 2.9 firmware onto the RCX. When you are downloading 2.9 firmware, try to block any ambient light that might disrupt the IR transmitter beam by turning off any o ...

  17. questionWhy do my RCX sensors change values over long periods of time?
    Powered sensors are sensitive to the amount of charge left on the batteries. Over long periods of time (hours) the amount of charge on the battery will change causing a slight drift in sensor readings. To avoid unreliable sensors over long time periods, use the wall plug for the RCX so that the ...

  18. questionIs it possible to plug a motor into the input ports?
    Yes, on the RCX. The motors can be treated as sensors. The NXT motors can be used as sensors while plugged into an output port. By clicking on the NXT comands icon, in the new Robolab software, a selection of "Value of" icons will be avaible for output ports A, B, and C By connecting a motor to ...

  19. questionHow do I plug my RCX transmitter (tower) into my computer?
    There are two different types of transmitters, and depending on which one you have, it plugs into a different port on your computer. The USB IR transmitter is powered by USB and does not require a battery. It plugs into the USB port on your computer (the network symbol on the plug should face ...

  20. questionWhen I do things in real life, it takes a while before they show up on the camera.
    The computer does not have enough power or memory to keep up a fast framerate for the camera, so the images may appear delayed or choppy. If you are using a laptop, this problem may be remedied by running the computer off of AC power rather than the battery. Try closing any programs that are ope ...

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